Why does loading for different projects have hash codes or checksums?

Question

I have never used a checksum when downloading various executables or mail files from the Internet. I know that it is used to check consistency and add some security. But this is necessary when you boot from a respectable project such as Apache or Microsoft. How many of us actually use checksums or hash codes to verify the content?

FYI, please let me know if I deviate too far from the valid content of StackOverflow.

Answer 1

, (, iso Linux), md5sum .

, , NIC.

Answer 2

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,

• - CD/-/etc
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Answer 3

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, .

Answer 4

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Answer 5

Imho , , (.. ).

Answer 6

, (, Apache.org), , , mirror . , . , , ( ) . , , ( - .)

Answer 7

( ftp-, , , ascii). , , , a b ( ).

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Answer 8

MacPorts Mac OS X, ; Portfile , , , Mac OS X. Portfile tarball . ; tarball , , , - , .

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